Schif Schaf wrote:
On Feb 7, 12:19 am, "Alf P. Steinbach" <al...@start.no> wrote:
I haven't used regexps in Python before, but what I did was (1) look in the
documentation,
[snip]
<code>
import re
text = (
"Lorem [ipsum] dolor sit amet, consectetur",
"adipisicing elit, sed do eiusmod tempor",
"incididunt ut [labore] et [dolore] magna aliqua."
)
withbracks = re.compile( r'\[(.+?)\]' )
for line in text:
print( re.sub( withbracks, r'{\1}', line) )
</code>
Seems like there's magic happening here. There's the `withbracks`
regex that applies itself to `line`. But then when `re.sub()` does the
replacement operation, it appears to consult the `withbracks` regex on
the most recent match it just had.
I suspect Alf's rustiness with regexps caused him to miss the
simpler rendition of
print withbacks.sub(r'{\1}', line)
And to answer those who are reaching for other non-regex (whether
string translations or .replace(), or pyparsing) solutions, it
depends on what you want to happen in pathological cases like
s = """Dangling closing]
with properly [[nested]] and
complex [properly [nested] text]
and [improperly [nested] text
and with some text [straddling
lines] and with
dangling opening [brackets
"""
where you'll begin to see the differences.
-tkc
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